Mercurial > hg
annotate mercurial/dirs.c @ 31957:84f9eb9758c0
atexit: test failing handlers
author | Bryan O'Sullivan <bryano@fb.com> |
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date | Tue, 11 Apr 2017 14:54:12 -0700 |
parents | 1e5ff5ae1d2b |
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1 /* |
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2 dirs.c - dynamic directory diddling for dirstates |
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3 |
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4 Copyright 2013 Facebook |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 */ |
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9 |
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10 #define PY_SSIZE_T_CLEAN |
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11 #include <Python.h> |
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12 #include "util.h" |
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13 |
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14 #ifdef IS_PY3K |
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15 #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[1] |
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16 #else |
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17 #define PYLONG_VALUE(o) PyInt_AS_LONG(o) |
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18 #endif |
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19 |
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20 /* |
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21 * This is a multiset of directory names, built from the files that |
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22 * appear in a dirstate or manifest. |
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23 * |
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24 * A few implementation notes: |
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25 * |
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26 * We modify Python integers for refcounting, but those integers are |
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27 * never visible to Python code. |
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28 * |
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29 * We mutate strings in-place, but leave them immutable once they can |
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30 * be seen by Python code. |
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31 */ |
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32 typedef struct { |
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33 PyObject_HEAD |
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34 PyObject *dict; |
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35 } dirsObject; |
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36 |
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37 static inline Py_ssize_t _finddir(const char *path, Py_ssize_t pos) |
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38 { |
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39 while (pos != -1) { |
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40 if (path[pos] == '/') |
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41 break; |
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42 pos -= 1; |
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43 } |
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44 |
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45 return pos; |
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46 } |
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47 |
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48 static int _addpath(PyObject *dirs, PyObject *path) |
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49 { |
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50 const char *cpath = PyBytes_AS_STRING(path); |
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51 Py_ssize_t pos = PyBytes_GET_SIZE(path); |
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52 PyObject *key = NULL; |
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53 int ret = -1; |
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54 |
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55 /* This loop is super critical for performance. That's why we inline |
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56 * access to Python structs instead of going through a supported API. |
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57 * The implementation, therefore, is heavily dependent on CPython |
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58 * implementation details. We also commit violations of the Python |
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59 * "protocol" such as mutating immutable objects. But since we only |
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60 * mutate objects created in this function or in other well-defined |
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61 * locations, the references are known so these violations should go |
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62 * unnoticed. The code for adjusting the length of a PyBytesObject is |
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63 * essentially a minimal version of _PyBytes_Resize. */ |
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64 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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65 PyObject *val; |
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66 |
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67 /* It's likely that every prefix already has an entry |
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68 in our dict. Try to avoid allocating and |
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69 deallocating a string for each prefix we check. */ |
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70 if (key != NULL) |
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71 ((PyBytesObject *)key)->ob_shash = -1; |
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72 else { |
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73 /* Force Python to not reuse a small shared string. */ |
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74 key = PyBytes_FromStringAndSize(cpath, |
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75 pos < 2 ? 2 : pos); |
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76 if (key == NULL) |
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77 goto bail; |
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78 } |
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79 /* Py_SIZE(o) refers to the ob_size member of the struct. Yes, |
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80 * assigning to what looks like a function seems wrong. */ |
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81 Py_SIZE(key) = pos; |
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82 ((PyBytesObject *)key)->ob_sval[pos] = '\0'; |
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83 |
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84 val = PyDict_GetItem(dirs, key); |
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85 if (val != NULL) { |
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86 PYLONG_VALUE(val) += 1; |
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87 break; |
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88 } |
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89 |
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90 /* Force Python to not reuse a small shared int. */ |
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91 #ifdef IS_PY3K |
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92 val = PyLong_FromLong(0x1eadbeef); |
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93 #else |
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94 val = PyInt_FromLong(0x1eadbeef); |
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95 #endif |
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96 |
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97 if (val == NULL) |
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98 goto bail; |
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99 |
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100 PYLONG_VALUE(val) = 1; |
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101 ret = PyDict_SetItem(dirs, key, val); |
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102 Py_DECREF(val); |
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103 if (ret == -1) |
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104 goto bail; |
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105 Py_CLEAR(key); |
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106 } |
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107 ret = 0; |
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108 |
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109 bail: |
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110 Py_XDECREF(key); |
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111 |
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112 return ret; |
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113 } |
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114 |
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115 static int _delpath(PyObject *dirs, PyObject *path) |
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116 { |
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117 char *cpath = PyBytes_AS_STRING(path); |
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118 Py_ssize_t pos = PyBytes_GET_SIZE(path); |
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119 PyObject *key = NULL; |
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120 int ret = -1; |
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121 |
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122 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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123 PyObject *val; |
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124 |
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125 key = PyBytes_FromStringAndSize(cpath, pos); |
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126 |
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127 if (key == NULL) |
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128 goto bail; |
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129 |
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130 val = PyDict_GetItem(dirs, key); |
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131 if (val == NULL) { |
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132 PyErr_SetString(PyExc_ValueError, |
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133 "expected a value, found none"); |
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134 goto bail; |
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135 } |
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136 |
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137 if (--PYLONG_VALUE(val) <= 0) { |
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138 if (PyDict_DelItem(dirs, key) == -1) |
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139 goto bail; |
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140 } else |
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141 break; |
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142 Py_CLEAR(key); |
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143 } |
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144 ret = 0; |
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145 |
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146 bail: |
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147 Py_XDECREF(key); |
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148 |
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149 return ret; |
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150 } |
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151 |
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152 static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar) |
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153 { |
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154 PyObject *key, *value; |
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155 Py_ssize_t pos = 0; |
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156 |
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157 while (PyDict_Next(source, &pos, &key, &value)) { |
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158 if (!PyBytes_Check(key)) { |
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159 PyErr_SetString(PyExc_TypeError, "expected string key"); |
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160 return -1; |
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|
161 } |
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162 if (skipchar) { |
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parsers: inline fields of dirstate values in C version
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163 if (!dirstate_tuple_check(value)) { |
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164 PyErr_SetString(PyExc_TypeError, |
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165 "expected a dirstate tuple"); |
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166 return -1; |
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|
167 } |
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168 if (((dirstateTupleObject *)value)->state == skipchar) |
18900
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169 continue; |
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|
170 } |
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171 |
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172 if (_addpath(dirs, key) == -1) |
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173 return -1; |
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|
174 } |
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|
175 |
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|
176 return 0; |
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|
177 } |
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178 |
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179 static int dirs_fromiter(PyObject *dirs, PyObject *source) |
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180 { |
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181 PyObject *iter, *item = NULL; |
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182 int ret; |
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183 |
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184 iter = PyObject_GetIter(source); |
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185 if (iter == NULL) |
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186 return -1; |
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187 |
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188 while ((item = PyIter_Next(iter)) != NULL) { |
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189 if (!PyBytes_Check(item)) { |
18900
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190 PyErr_SetString(PyExc_TypeError, "expected string"); |
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191 break; |
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|
192 } |
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193 |
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194 if (_addpath(dirs, item) == -1) |
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195 break; |
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|
196 Py_CLEAR(item); |
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|
197 } |
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198 |
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199 ret = PyErr_Occurred() ? -1 : 0; |
23960
bca4b6f126f2
dirs: fix leak of iterator in dirs_fromiter
Augie Fackler <augie@google.com>
parents:
21809
diff
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|
200 Py_DECREF(iter); |
18900
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201 Py_XDECREF(item); |
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202 return ret; |
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|
203 } |
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|
204 |
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|
205 /* |
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206 * Calculate a refcounted set of directory names for the files in a |
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207 * dirstate. |
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|
208 */ |
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209 static int dirs_init(dirsObject *self, PyObject *args) |
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210 { |
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211 PyObject *dirs = NULL, *source = NULL; |
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|
212 char skipchar = 0; |
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|
213 int ret = -1; |
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|
214 |
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|
215 self->dict = NULL; |
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|
216 |
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217 if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar)) |
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218 return -1; |
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|
219 |
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|
220 dirs = PyDict_New(); |
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221 |
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222 if (dirs == NULL) |
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223 return -1; |
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|
224 |
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|
225 if (source == NULL) |
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226 ret = 0; |
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227 else if (PyDict_Check(source)) |
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228 ret = dirs_fromdict(dirs, source, skipchar); |
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229 else if (skipchar) |
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230 PyErr_SetString(PyExc_ValueError, |
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231 "skip character is only supported " |
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diff
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|
232 "with a dict source"); |
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|
233 else |
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234 ret = dirs_fromiter(dirs, source); |
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235 |
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236 if (ret == -1) |
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|
237 Py_XDECREF(dirs); |
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|
238 else |
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|
239 self->dict = dirs; |
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|
240 |
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|
241 return ret; |
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|
242 } |
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243 |
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244 PyObject *dirs_addpath(dirsObject *self, PyObject *args) |
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245 { |
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246 PyObject *path; |
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247 |
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248 if (!PyArg_ParseTuple(args, "O!:addpath", &PyBytes_Type, &path)) |
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249 return NULL; |
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250 |
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251 if (_addpath(self->dict, path) == -1) |
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252 return NULL; |
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253 |
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254 Py_RETURN_NONE; |
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255 } |
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256 |
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257 static PyObject *dirs_delpath(dirsObject *self, PyObject *args) |
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258 { |
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259 PyObject *path; |
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260 |
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261 if (!PyArg_ParseTuple(args, "O!:delpath", &PyBytes_Type, &path)) |
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262 return NULL; |
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263 |
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264 if (_delpath(self->dict, path) == -1) |
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265 return NULL; |
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266 |
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267 Py_RETURN_NONE; |
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268 } |
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269 |
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270 static int dirs_contains(dirsObject *self, PyObject *value) |
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271 { |
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272 return PyBytes_Check(value) ? PyDict_Contains(self->dict, value) : 0; |
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273 } |
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274 |
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275 static void dirs_dealloc(dirsObject *self) |
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276 { |
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277 Py_XDECREF(self->dict); |
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278 PyObject_Del(self); |
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279 } |
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280 |
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281 static PyObject *dirs_iter(dirsObject *self) |
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282 { |
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283 return PyObject_GetIter(self->dict); |
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284 } |
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285 |
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286 static PySequenceMethods dirs_sequence_methods; |
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287 |
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288 static PyMethodDef dirs_methods[] = { |
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289 {"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"}, |
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290 {"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"}, |
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291 {NULL} /* Sentinel */ |
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292 }; |
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293 |
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294 static PyTypeObject dirsType = { PyVarObject_HEAD_INIT(NULL, 0) }; |
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295 |
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296 void dirs_module_init(PyObject *mod) |
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297 { |
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298 dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains; |
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299 dirsType.tp_name = "parsers.dirs"; |
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300 dirsType.tp_new = PyType_GenericNew; |
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301 dirsType.tp_basicsize = sizeof(dirsObject); |
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302 dirsType.tp_dealloc = (destructor)dirs_dealloc; |
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303 dirsType.tp_as_sequence = &dirs_sequence_methods; |
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304 dirsType.tp_flags = Py_TPFLAGS_DEFAULT; |
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305 dirsType.tp_doc = "dirs"; |
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306 dirsType.tp_iter = (getiterfunc)dirs_iter; |
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307 dirsType.tp_methods = dirs_methods; |
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308 dirsType.tp_init = (initproc)dirs_init; |
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309 |
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310 if (PyType_Ready(&dirsType) < 0) |
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311 return; |
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312 Py_INCREF(&dirsType); |
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313 |
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314 PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType); |
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315 } |